2006 and newer General Motors vehicles equipped with 6L45, 6L50, 6L80
and 6L90 automatic transmissions often come in with complaints of
lock-up cycling or a surging sensation, as well as shift solenoid or TFP
performance codes due to sticking clutch select valves.
The lock up cycling complaint is often due to the poor resolution
(accuracy) of the original equipment TCC regulator valve and spring in
relation to the TCC solenoid function. The torque converter clutch
regulator valve function is to regulate the torque converter clutch
apply pressure. The computer varies the pulse width modulation of the
TCC solenoid to control the slip speed of the lock-up clutch. The OE
design valve and spring calibration does not provide adequate resolution
under all driving conditions which leads to the TCC slip cycling. The
new design TCC regulator valve and spring provides a higher degree of
accuracy in controlling the slip speed, especially at lower road speeds.
The difference in drivability is quite remarkable.
The clutch select valves direct fluid to various clutch elements
depending on the shift solenoid command status. The OE select valves are
prone to sticking or dragging in their bore. When one of the clutch
select valves sticks or drags, the computer sets a solenoid performance
or TFP switch code. The computer assumes that the solenoid did not
function correctly as the computer has no way to determine if the
solenoid, clutch select valve or the TFP switch malfunctioned. The
solenoid performance and TFP codes are very misleading. Quite often, the
real problem is the clutch select valve sticking in the bore. Sticking
or dragging clutch select valves often lead to unnecessary solenoid
replacement.
Features and benefits:
The TransGo drop-in redesign USA-made hardened steel TCC regulator
valve, features longer lands which restores the hydraulic integrity of
the circuit by utilizing previously unused and therefore unworn areas of
their bore. In addition, the special design valve and spring
calibration enables the computer to control the TCC regulation more
accurately, which results in better slip control. Lastly, the drop-in
USA-made hardened steel clutch select valves greatly help prevent the
valves from sticking in their bores.
Corrects/Prevents/Reduces:
- Shift solenoid performance codes or false P0751 due to sticking or dragging clutch select valves
- Low speed TCC surge
- TCC cycling during cylinder deactivation
- Extends converter clutch lining durability
Includes:
- Precision USA-made hardened steel TCC regulator valve
- TCC regulator valve calibration spring
- (2) USA-made hardened steel clutch select valves
- (2) Clutch select valve springs for units with updated OEM separator plate
